// 已读取AGENTS.md
import { onShareAppMessage, onShareTimeline, onShow } from '@dcloudio/uni-app';
import { onMounted } from 'vue';

const DEFAULT_SHARE_TITLE = '同城陪伴 · 专业游戏陪玩与生活陪伴';
const DEFAULT_INDEX_PATH = '/pages/index/index';

/**
 * 获取当前登录用户的邀请码/用户ID，用于分销裂变与邀请自动绑定
 */
export function getShareInviterParams() {
  try {
    const uid = uni.getStorageSync('userId');
    if (uid) {
      return {
        inviterId: String(uid),
        code: `PW${uid}`
      };
    }
  } catch (_) {}
  return {
    inviterId: '',
    code: ''
  };
}

/**
 * 构造携带邀请人参数与页面参数的分享路径 (用于 onShareAppMessage)
 */
export function buildSharePath(basePath = DEFAULT_INDEX_PATH, extraParams = {}) {
  const { inviterId, code } = getShareInviterParams();
  const params = { ...extraParams };
  if (inviterId && !params.inviterId) {
    params.inviterId = inviterId;
  }
  if (code && !params.code) {
    params.code = code;
  }

  const queryParts = [];
  for (const key of Object.keys(params)) {
    const val = params[key];
    if (val !== undefined && val !== null && val !== '') {
      queryParts.push(`${encodeURIComponent(key)}=${encodeURIComponent(val)}`);
    }
  }

  const cleanBase = (basePath || DEFAULT_INDEX_PATH).split('?')[0];
  const queryStr = queryParts.join('&');
  return queryStr ? `${cleanBase}?${queryStr}` : cleanBase;
}

/**
 * 构造朋友圈分享的 query 参数字符串 (用于 onShareTimeline，微信规范 query 不带 ?)
 */
export function buildTimelineQuery(extraParams = {}) {
  const { inviterId, code } = getShareInviterParams();
  const params = { ...extraParams };
  if (inviterId && !params.inviterId) {
    params.inviterId = inviterId;
  }
  if (code && !params.code) {
    params.code = code;
  }

  const queryParts = [];
  for (const key of Object.keys(params)) {
    const val = params[key];
    if (val !== undefined && val !== null && val !== '') {
      queryParts.push(`${encodeURIComponent(key)}=${encodeURIComponent(val)}`);
    }
  }
  return queryParts.join('&');
}

/**
 * 显式唤起微信小程序分享菜单 (同时激活【转发给朋友】与【分享到朋友圈】)
 */
export function enableShareMenu() {
  // #ifdef MP-WEIXIN
  try {
    if (uni.canIUse && uni.canIUse('showShareMenu')) {
      uni.showShareMenu({
        withShareTicket: true,
        menus: ['shareAppMessage', 'shareTimeline']
      });
    }
  } catch (_) {}
  // #endif
}

/**
 * 页面级分享统一 Composable (支持在 Vue3 <script setup> 内直接调用)
 * @param {Object|Function} options - 分享配置或动态 Getter 函数
 */
export function useShare(options = {}) {
  onMounted(() => {
    enableShareMenu();
  });

  onShow(() => {
    enableShareMenu();
  });

  // 1. 监听【发送给朋友 / 微信好友 / 微信群】
  onShareAppMessage((res) => {
    const opt = typeof options === 'function' ? options(res) : options;
    const title = (opt && opt.title) || DEFAULT_SHARE_TITLE;
    const basePath = (opt && opt.path) || DEFAULT_INDEX_PATH;
    const extraParams = (opt && opt.params) || {};
    const finalPath = buildSharePath(basePath, extraParams);
    const result = {
      title,
      path: finalPath
    };
    if (opt && opt.imageUrl) {
      result.imageUrl = opt.imageUrl;
    }
    return result;
  });

  // 2. 监听【分享到朋友圈】
  onShareTimeline(() => {
    const opt = typeof options === 'function' ? options() : options;
    const title = (opt && opt.timelineTitle) || (opt && opt.title) || DEFAULT_SHARE_TITLE;
    const extraParams = (opt && opt.params) || (opt && opt.query) || {};
    const query = typeof extraParams === 'string' ? extraParams : buildTimelineQuery(extraParams);
    const result = {
      title,
      query
    };
    if (opt && opt.imageUrl) {
      result.imageUrl = opt.imageUrl;
    }
    return result;
  });
}

/**
 * 全局共享 Mixin (在 main.js 中注册，为所有未显式定义分享的页面提供兜底分享能力)
 */
export const shareMixin = {
  onMounted() {
    enableShareMenu();
  },
  onShow() {
    enableShareMenu();
  },
  onShareAppMessage() {
    let currentPath = DEFAULT_INDEX_PATH;
    try {
      const pages = getCurrentPages();
      if (pages && pages.length > 0) {
        const cur = pages[pages.length - 1];
        if (cur && cur.route) {
          currentPath = '/' + cur.route;
        }
      }
    } catch (_) {}
    return {
      title: DEFAULT_SHARE_TITLE,
      path: buildSharePath(currentPath)
    };
  },
  onShareTimeline() {
    return {
      title: DEFAULT_SHARE_TITLE,
      query: buildTimelineQuery()
    };
  }
};